In 2009, China's total orders for marine engineering and equipment were over US $ 18 billion, accounting for 29.5% of the world market share, 16 percentage points higher than that in 2012, and surpassed Singapore, ranking second in the world. New to undertake a variety of offshore engineering platform a total of 61 and a drilling vessel, of which 49 jack-up drilling platform, accounting for more than half of the world's total.

In 2013, the national shipbuilding completed 45.44 million dwt, down 24.7%, of which the ship was 15.51 million tons of gross tonnage; new ship orders 6984 million dwt, an increase of 242.2%, of which 22.81 million sea Ton. As of the end of December, holding ship orders of 131 million dwt, an increase of 22.5%, of which 42.46 million tons of marine tonnage, exports of ships accounted for 88.1% of the total.

In 2013, China's shipbuilding market share of the three major indicators continue to maintain the world's leading shipbuilding completion, new orders, hand held orders accounted for 41.4% of the world's total, 47.9% and 45.0%, of which new orders than 2012 Year increased by 4.3 percentage points. New orders for ships to further focus on the advantages of enterprises, 2013, the first 20 companies to undertake a total of 55.86 million dwt, accounting for 80.0% of the total, compared with 2012 increased by 5.5 percentage points. (LNG) and four 83,000 cubic meters of large liquefied gas carrier (VLGC), with a total of six new 174,000 cubic meters of dual fuel power propulsion. New to undertake 8000 boxes and above large container ship total of 64, accounting for about 40% of the world total.

The connector is also called a connector. Domestic also known as joints and sockets, generally refers to the electrical connector. That is, devices that connect two active devices, transmit current or signal.

In all the electronic components that make up the whole system, the connector looks like the structure is simple and can not get attention, but its failure probability is the highest.

The three basic features of the connector

1. Mechanical performance In terms of connection function, the insertion force is an important mechanical property; another important mechanical property is the mechanical life of the connector.

2. Electrical performance The main electrical performance of the connector includes contact resistance, insulation resistance and electrical strength.

3. Environmental performance Common environmental performance including temperature, moisture, salt spray, vibration and shock.

Terminals There are three common types of fatal faults:

Poor contact

2. Poor insulation

3. Fixed badly

The quality of the connector gold-plated layer is one of the important parameters to evaluate the quality of the connector. The base material of the connector is a copper alloy, the surface coating is gold and its alloy, between the base copper and the surface gold plating.

The ship's normal lighting system, also known as the main lighting system, is distributed throughout the ship's various living and workplaces, providing the cabin and the workplace with sufficient illumination.

The system is characterized by: the main switchboard on the lighting busbar directly to the lighting distribution box power supply, and then by the lighting distribution box to the adjacent compartment or area of the lighting power supply;

Lighting voltage is generally AC, DC 110 V or 220 V;

Different compartments and spaces have different illumination requirements; all lighting fixtures are equipped with control switches.

Normal lighting is the main body of the ship lighting, by the ship's main generator power supply, where the ship's life and work should be lit.

Normal lighting includes:

(1) the main lighting of the cabin, such as the top of the dome;

(2) local or auxiliary lighting, such as bed lamps, wall lamps, toilet lights, etc .;

(3) loading and unloading light lighting;

(4) indoor and outdoor walkway more than half of the lighting;

(5) receptacles that must be provided in each compartment.

Non-critical equipment with equal or less than 0.25 kW of electric fans, refrigerators and cabin heaters can also be included in the normal lighting system.